Investigation of the pore formation in anodic aluminium oxide

Mathematical Modeling of Self‐Organized Porous Anodic Oxide Films

“…He proposed that low density oxide initially formed at the metal interface later recrystallizes to a higher density phase near the solution interface, with pores initiating at cracks produced by tensile stress in the oxide surrounding the nanocrystals. Self-ordering of pores on Al has been attributed to lateral electrical migration [92], or lateral migration coupled with oxide dissolution [93]. Gösele and coworkers considered that self-ordering is produced by elastic repulsion between oxide cells, as a result of compressive forces produced by the volume increase upon oxide formation [2,34,53].…”

A new self-ordering regime for fast production of long-range ordered porous anodic aluminum oxide films

“…It is worth mentioning that the 'two-step anodization' process is the most commonly used method to obtain highly ordered porous AAO films [15][16][17][18]23,24,30,31]. Therefore, finding proper conditions of the first anodization for achieving long-range ordered structural cell arrangement at the barrier layer surface of AAO films is significant.…”

“…Therefore, finding proper methods for production of these materials has attracted considerable attention, and will continue to prosper in the next few years. Porous anodic aluminum oxide (AAO) films formed by electrochemical anodization process of aluminum have been investigated for more than a century [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. It has been known that porous AAO films with highly ordered pores (i.e., the honeycomb structure) can be obtained when anodization is performed under a self-ordering regime [15,16].…”

Morphology Characterisation of Pitting Corrosion on Sensitized Austenitic Stainless Steel by Digital Image Analysis

“…Many studies have been focused on the pit initiation and propagation mechanisms of this steel in chloride media [2][3][4][5][6][7][8][9][10], but relatively a few authors have considered the morphologic characteristics of pitting corrosion. It should be noted that pit growth rate depends on potential distribution inside the pit, which is determined by pit shape, especially by their width/depth aspect ratio [11,12].…”